unnecessary

From Longman Dictionary of Contemporary Englishunnecessaryun‧ne‧ces‧sa‧ry /ʌnˈnesəsəri $ -seri/ ●●○ adjectiveNEED#not needed, or more than is neededunnecessary expense/cost/extravagance etcan unnecessary expenseThere’s no point in taking unnecessary risks.We can’t afford any unnecessary delays.Williams was found guilty of causing unnecessary suffering to animals —unnecessarily /ʌnˈnesəsərəli $ ˌʌn-nesəˈserəli/ adverbI don’t want to worry you unnecessarily.COLLOCATIONSadverbstotally/completely/entirely unnecessaryThe suffering of these animals is totally unnecessary.quite unnecessary British English‘I’ll give you a lift.’ ‘Thank you, but that’s quite unnecessary.’nounsunnecessary sufferingShe admitted causing the dog unnecessary suffering.an unnecessary riskNeither team is likely to take any unnecessary risks, so the result will probably be a draw.an unnecessary expense/costHe thinks advertising is an unnecessary expense.an unnecessary extravagance (=something that costs more than is necessary or more than you can afford)The chairman called first-class airline travel an unnecessary extravagance.